I have recently opened an E-Bay Store and am selling N Scale castings (tunnel portals and retaining walls) and some storage / transport boxes at very reasonable prices. I have designed, molded and cast these myself.
Feel free to contact me or visit my ebay store,http://stores.ebay.com/Train-stuff-MORE_W0QQsspagenameZMEQ3aFQ3aSTQQtZkm for details.